The American practical navigator, being an epitome of navigation and nautical astronomy (1903)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 78
oon, which is also the Right A.^censionof the Mean Sun. 277. Civil and Astronomical Ti.me.—The Civil Day commences at midnight and comprises thetwenty-four hours until the following midnight. The hours are counted from 0 to 12, from midnight tonoon; then, again, from 0 to 12, from noon to midnight.… … The Astronomical or Solar Day commences at noon of the civil day of the same date. It comprisestwenty-four hours, reckoned from 0 to 24, from noon of one day to noon of the next. Astronomical time(apparent or mean) is the hour angle of the sun (true or mean) measured to the westward throughoutits…
Navigation · Nautical astronomy
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